Features Made of durable, environmentally friendly nylon PA66, which has the stable and durable performance of acid resistance, alkali resistance, insulation and anti-signal interference. With smooth surface, clean and clear thread, they look very beautiful, very convenient and practical to use. Ideal for mounting between circuit boards, circuit boards and machine boards, is great for creating heat channels between chips or creating multi-level "nerd" arrays from homemade circuit boards. They do not slip easily when used properly. There are 4 different sets available for your building needs, including a variety of male or female spacers, nuts and screws. Specification: Material: PA66 Nylon Thread type: M2, M3. Colour: black. Package A B C D Man-woman patchoff, M3 x 6 + 6 mm, pack of 25. M2*5+3mm 25pcs M3*8+6mm 25pcs M2*6+3mm 25pcs M3*10+6mm 25pcs M2*8+3mm 25pcs M3*12+6mm 25pcs M2*10+3mm 25pcs M3*15+6mm 25pcs M2*12+3mm 25pcs M3*20+6mm 25pcs M2 x 15 + 3 mm, 25 pieces. Distance between women and women. M3 x 6 mm 25 pieces. M2 x 5 mm 25 pieces. M3 x 8 mm 25 pieces. M2 x 6 mm 25 pieces. M3 x 10 mm, pack of 25. M2 x 8 mm, 25 pieces. M3*12mm 25pcs M2 x 10 mm, pack of 25. M3 x 15 mm 25 pieces. M2 x 12 mm 25 pieces. M3 x 20 mm, pack of 25. M2 x 15 mm, 25 pieces, M3 x 6 mm. Pack of 50. M2 x 5 mm, 50 pieces. M2 x 5 mm, 100 pieces, M3, 50 StM3 x 6 mm, pack of 100. M2 50 pieces, total 250 pieces. Pack of 250. Pack of 250. Pack of 250. Box size: A: 17.50 x 10.00 x 2.30 cm / 6.89 x 3.94 x 0.91 inches. B: 18.00 x 10.00 x 2.50 cm / 7.09 x 3.94 x 0.98 inches. C: 13.00 x 7.00 x 2.50 cm/5.12 x 2.76 x 0.98 inches. D: 13.00 x 7.00 x 2.50cm/5.12" x 2.76" x 0.98" (Optional) Package weight: approx. 46-101g Quantity: 250pcs/box Box contents: 1 x box of 250 spacers. M3 x 6 mm. Pack of 100 Package List